Rotary screen or plate for producing same



Dec. 11, 1928. 1,694,498

W. C. BRUTON ROTARY SCREEN 0R PLATE FOR PRODUCING SAME Filed 'April 6, 1927 wzwa; afcfm zrakzrmzq Dec. ll, i928.

ll YATES TEJILTQIAM CHARLTON BRUTON,

OF BERKELEY, CALIFORNIA, ASSEGNOB TO .%.MERICAN MANGANESE STEEL COMPANY, OF CHICAGO, ILLINOIS A CORPORATION OF MAINE.

ROTARY sonnnn on rtarn non raonncine sinus.

Application filed April 6,

the screen and the material necessary to agitate the latter and cause the reduced. portions to pass through the screen openings.

Screens of this kind are usually built up of separately formed plates, particularly when their dimensions are such as to admit of production of the screen by the art of castin hence, the term screens as used in this specification is to be regarded as including in its scope screening plates as well complete screens. Screens as orcinarily constructed have theiropenings, calibered to gauge the size of particles escaping therethrough, formed on radii of the screen and they are of massive construction so that the confines of their said openings comprise faces of substantial dimensions measured by the thickness of the wall which is penetrated; but this so retards the escape of the fines or particles of material small enough to escape as to not only greatly reduce the capacity of the holes but to cause the material to accumulate in the third quadrant of the screen a result of centrifugal force or the driving effectof the screen upon the material.

To avoid these defects and insure the escape of the material over a relatively greater arc of the inner surface of the screen, and thereby enlarge the screenin capacity without interfering with its gauging capacity, the present invention inclines the faces which constitute the rear or trailing confines of the openings outwardly and rearwardly, or in a direction to make them approach tangents to the wall, and there changes the direction of the openings by inclining them toward a direction parallel with a tangent of the screen at the inner end of the opening, so that the inertia of and outward pressure upon the material which is intended to be discharged as the screen moves beneath it, can act in a man ner to accelerate the discharge and avoid clogof the openings. To still further facilitate the discharge, the inclination of the opening is confined to the trailing wall of the opening, or that wall which is to the rear with reference to the rotation of the screen, the leading wall of the'opening, or the wall which is forward in the direction of rotation,

1927. Serial 1%. 181,356.

being left-sufficiently near tothe radial posi-' 1 tion (although not in co-incidence therewith) to still further guard against clogging ofv the holes. The dimension of the holes, in the direction parallel to the axis of the screen, may be left constant with the inner ends of the openings. 7 r x By way of illustrating one embodiment of the invention, the accompanying drawing shows in Figure 1 a transverse section, and in Figure 2 a side elevation of a fragmentary portion of a screen havln openings constructed in accordance with the present invention. I

In the wall 1 which is of massive construction providing a substantial thickness, are formed openings, the-inner or receiving ends 2 of which may be Of circular 0T pp ly circular form, as indicated by full and dotted lines in FigureQ, but the outer or discharge ends 3 are inclined rearwardly with reference to the rotation of the screen (indi cated by the arrow X) this inclinationbeing to a degree that brings. the effective passageway of each opening as near to tangent of the surface of the screen, at the radial point of the opening, as is possible without seriously weakening the screen structure or adding:

undue complication in foundry practice, which is preferably resorted to in the production of the screen. The rearward'inclination referred to is important mainly with respect to the face which provides the rear or trailing confine e of the opening; the forward face 5 need notbeso severely inclined, in fact, is preferably inclined to a much less degree, and by so doing a substantial divergence is secured between the faces l and 5, and the chance of material packing in the opening is correspondingly lessened. As shown inFigure 2, the side faces 6 of the openings may retain a distance apart corresponding to the diameters of the intake ends 2 of the openings.

A screen constructed with openings of the kind described can readily casting metal, and particularly metal of a character which is peculiarly adapted to withsand the abrasive act-ion of mineral substances, and when so constructed, is found to e produced by 100 greatly speed up the discharge of the screen 0 without affecting the quality of the screens action; and this 13 true in the preferred embodiment of the 1nvention even after the innor wall of the screen has become materially worn, since the holes flare onlyin the direction of movement, the dimension transverse to the direction of movement being substan tially constant.

I claim 1. A circumferential wall for rotary mineral separators, having discharge openings, the inner or receiving ends of which are calibered to gauge the material discharged; said wall I being of massive construction and having a thickness that provides, by the extension of its openings through it, and as confines of its eral separators, having discharge openings,

the inner or receiving ends of which are calibered to gauge the material discharged; said wall being of massive construction and having a thickness that provides, by the-extension of its openings through it, and as confines of.

its said openings, faces of substantial dimensions; the face which provides the rear or trailing confine of each opening being inclined outwardly and rearwardly at a relatively large angle toward the tangent of the screen at the opening; and the face which provides the opposite forward confine of the opening being also inclined outwardly and rearwardly but at a materially less angle than the rear wall, so that the openings are flared circmnferentially of the screen and assume a direction approaching that of the naturalof its openings through it, and as confines of its said openings, faces of substantial dimensions; the face which provides the rear or trailing confine of each opening being inclined outwardly andrearwardly at a relatively large angle toward the tangent'of the screen at the opening, so that the openings are flared circumferentially of the screen and assume a direction approaching that of the natural flow of material escaping from the separator under the internal pressure and its own inertia; and the faces which provide the lateral confines of the openings being spaced a distance corresponding substantially to the gauging dimension of the openings.

Signed at Oakland, California, this ninth day of March, 1927.

WILLIAM CHARLTON BRUTON. 

